Safety razor



p 1935- I. HARTMANN NEE BDHM 2,054,287

SAFETY RAZOR Filed April 27, 1934 2 Sheeias-Sheet 1 .Zn uenfar v Ilse Harirrzanml/fio'hm S p 15, 1936- HARTMANN NEE BOHM 2,054,287

SAFETY RAZOR Filed April 27, 1934 2 Sheets-Sheet 2 "III/ll I/I/ \IIIIIIIII lily.

Patented Sept. 15, 1936 SAFETY RAZOR Ilse Hartmann ne Biihm, Stuttgart, Germany, assignor to Kupfer-Asbest-Co., Gustav Bach, Heilbrounn-the-Neckar, Germany Application April 27, 1934, Serial No. 722,774 In Germany September 15, 1933 Claims.

My invention relates to safety razors of the kind in which guard members shaped as supporting rollers or supporting combs are provided for securing a uniform distance of the cutting 5 edge of the blade from the skin of the user.

It has already been suggested to design such supporting members as rollers rotatably mounted on a shaft connected with the blade holder so that the rollers are enabled to roll on the skin during the movement of the razor, and the friction is reduced.

It is an object of my invention to improve razors provided with supporting members of the kind referred to by arranging the supporting members with axial play so that they are enabled to be displaced in axial direction with respect to the razor head and the blade. In consequence thereof the supporting members stick to the skin within the limits set by such axial play while the blade performs its cutting movement.

My invention is particularly adapted for use in razors comprising a blade to which cutting movement is imparted by setting the razor head 25 vibrating at high frequencies, for instance by means of a small electromotor or an electromagnet, as described in my copending application executed of even date herewith for safety razor. If in a razor of this type the support- 30 ing members are rigidly connected to the blade, it may occur that the cutting movement of the blade is interfered with, or arrested altogether, if the razor is pressed too strongly against the skin. In a razor according to my invention, however, the supporting rollers or combs stick to the skin while the blade performs its oscillation, without being interfered with by the rollers or combs, thus also eliminating the friction which otherwise is caused by the supporting members 40 partaking of the oscillation of the blade.

In the razor according to my invention the supporting members may be designed as rollers loosely or rigidly arranged on their shafts. The rollers may be plain cylinders, or may be provided with grooves in order to facilitate the abduction of the lather and the cut-ofi hairs.

In the drawings affixed to this specification and forming part thereof some embodiments of my invention are illustrated diagrammatically by way of example.

In the drawings Fig. 1 is an elevation, partly in section, of the' head of a razor according to my invention,

Figs. 2 to 4 are plan views of three embodiments of blade holders adapted for use in .a razor according to my invention,

Fig. 5 is a plan view, partly in section, of a portion of the blade holder shown in Fig. 2, drawn to an enlarged scale,

Figs. 6 and 7 are sectional elevations of two embodiments of a razor according to my invention in which a cutting movement is imparted to the blade by electrical means.

In all figures corresponding parts are marked with the same reference letters.

The razors shown in Figs. 1 to '7 comprise a razor head a, to the upper end of which a blade holder 1 forming the guard plate is secured. i is a blade which is secured to the blade holder by means of a clamping plate to which may be screwed to the central portion of the blade holder by a threaded stud w in a manner well known in the art. The blade holder i carries at both sides, or at one side only, grooved supporting members h, or plain supporting members k which are arranged in such manner that they are axially displaceable with respect to the blade holder 2' and the blade :i.

In the modifications illustrated in Figs. 1, 2, 5, 6 and 7, the supporting members are grooved rollers 11., of comparatively small diameter, which are rigidly secured on, or integral with, a shaft r. The shaftis mounted to rotate in a pair of bearings t, Fig. 5, at the ends of the blade holder 1, and the overall length of the rollers, which may be considered as cylinders grooved at v, is shorter than the space between the bearings, so that, in the central position illustrated in Fig. 5, the ends of a cylinder are at equal distances .9 from its bearings t. In this manner, relative displacement of the rollers and the blade holder i is permitted, and the sticking of the rollers to the skin does not interfere with the high frequency vibrations of the blade :i. The grooves '0 act like the interstices of a comb, for the abduction of lather and hairs. Obviously, it does not make a difference with respect to the free relative displacement of the blade holderv and the supporting members, whether the members are grooved rollers h, or plain rollers k.

with an electric device for imparting a cutting movement to the blade 1. In order to accomplish this an electromotor b comprising a stator winding n and an armature p supported in transverse walls q, is provided. The winding 11 is excited by means of a battery c arranged in the handle of the razor, the motor current being cut in and out by means of a switch d arranged at the lower end of the razor. The rotor p of the electromotor is shaped in such a manner that its gravity centre does not coincide with its axis of rotation which may be accomplished, for instance, by providing the rotor with a recess eccentrically arranged.

In operation the motor b is excited by closing the switch d so that the armature p is rotated. Since, however, the gravity centre of the armature does not coincide with the axis of rotation, the shaft of the armature exerts forces upon its bearings which are transmitted by means of the transverse walls q to the razor head a, the blade holder 2' and the blade 7', so that the latter performs circular vibrations or cutting movements. The supporting members h, however, sticking to the skin of the user, do not partake in the vibrations, provided that the amplitude of the vibrations does not exceed the upper limit of the axial displacements, Fig. 5, to which the supporting members may be subjected with respect to the blade holder.

In Fig. '7 the cutting movement of the blade 1' is produced by means of an electromagnet arranged in the razor head a and comprising a magnet winding m and an armature g arranged in the central gap of the core 1 of the magnet and forced with one of its ends against the inner wall of the razor head a by means of a spring a: the other end of the armature directly bearing on the razor head. Preferably the core 1/ and the armature g consist of magnetized iron or steel. The magnet winding m is supplied from an alternating current system (not shown) to which the razor may be connected by means of a plug P enclosing a transformer T, the secondary of which is connected to the winding m by means of a connection C. 1 when .the magnet is energized the armsture a performs linear reciprocations which are transmitted to the razor head a, the blade holder 1 and th blade 1. The operation of the supporting mem ers is the same as described in connection with Fig. 6, and it is understood that in both cases grooved or plain rollers may be provided at both sides of the blade holder i, or at one side only.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim:--

1. In a safety razor the combination, with a blade holder and means for setting said holder vibrating at high frequencies in the plane of said holder, of a guard supported by and mounted on said holder for free displacement in the plane in which said holder vibrates.

2. In a safety razor the combination, with a hollow handle, a blade holder on said handle and means housed in said handle for setting said holder vibrating at high frequencies in the plane of said holder, of a guard supported by and mounted on said holder for free displacement in the plane in which said holder vibrates.

3. In a safety razor the combination, with a hollow handle, a blade holder on said handle, and an electromotor and a gyratory member influenced by said electromotor housed in said handle, for setting said holder vibrating at high frequencies in the plane of said holder, of a guard supported by and mounted on said holder with free play so as to not interfere with the vibrations of said holder, when pressed onto the skin.

4. In a safety razor the combination, with a hollow handle, a blade holder on said handle and an electromagnet housed in said handle, for setting said holder vibrating at high frequencies in the plane of said holder, of a guard supported by and mounted on said holder with free play so as to not interfere with the vibrations of said holder, when pressed onto the skin.

5. In a safety razor the combination, with a blade holder and means for setting said holder vibrating at high frequencies in the plane of said holder, of a cylindrical guard revoluble about its axis and supported by and mounted on said holder for free displacement in the plane in which said holder vibrates.

ILSE HAR'I'MANN mil 136m. 

